Electric water heater



June 11, 1929.

M. ADAM ELECTRIC WATER HEATER Filed June 16, 1928 I A TTOiKE Y.

Patented June 11, 1929.

UNITED STATES MARIA M. ADAM, OF WASHINGTON, DISTRICT OF COLUMBIA.

ELECTRIC WATER HEATER.

Application filed June 16,

My invention relates to electric water heatters and relates particularly to an improvement in the electric water heater for which I have filed an application for Letters Patent of the United States on June 11, 1928, Serial No. 284,555, and my invention consists in the improved construction and arrangement of the water carrying coils and the heating element shown in said application.

Referring to the drawings:

Figure 1 is a central vertical sectional view of an electric water heater having my present improvements embodied therein, the space between the outer coiling of the water carry- 15 ing coil and the outer shell being shown somewhat exaggerated to allow space for conducting wires, and

Figure 2 is a top plan view of the same. Referring to the drawings, 5 indicates a cylindrical shell, oil painted on its interior having bottom 6 and removable top '7 held in place by detachable fastening means 8. Shell 5 is lined with asbestos 9* and mica 9 or similar heat insulating material as indicated at 9. \Vithin the shell 5 and suitably spaced therefrom is a cylinder 10 of insulating material resting on the bottom plate 6 and arranged concentric with shell 5. Between the cylinder 10 and shell 5 is a portion 11 of my water carrying coil extending upward from inlet 12 which is adapted to be connected with the water service pipe. At the upper end of the cylinder 10 this portion of the water car rying coil 11 is reduced in diameter as shown r at 13 with a portion 14 coiled within the cylinder 6 and extending downward to near the bottom plate 6 Where it is further reduced in'diameter as shown at 15 to a portion 16 which extends upward to the top of shell 5. From the upper end of this inner portion 16 a pipe 17 extends outward towards shell 5. The portions 11, 14, and 16, form together a single water carrying coil of relative large diameter at its inlet end and relative small r diameter at its discharge end but without joints thus avoiding the possibility of leakage to which oints are liable. A coupling 18 serves to connect the end of this pipe 17 to a pipe 19 having a T 20 at its outer end, to one branch of which is connected a downwardly extending pipe 21 to the lower end of which is connected by a swivel joint 22 pipe 23 car rying at its free end a faucet 24. The swivel joint permits the faucet to be swung to right or left so as to deliver water at any point throughout a Wide space.

1928. Serial No. 285,867.

The upper branch of T 20 extends upward to carry a heat indicating device such as a thermometer which will indicate the exact degree to which the water is heated. A pipe 27 leading from pipe 19 at a point outside shell 5 is connected with a suitable relief valve to serve as a safety valve.

ater entering through inlet 12 will follow through portion 11 of relatively large diameter and so placed that it will be at a distance from heat radiating means within the cylinder 10 and will be shielded from such radiated heat by cylinder 10. From the top of portion 11 the water will flow downward through portion 14, then upward through inner portion 16 to be delivered through pipe 17 and its connections to the faucet 24.

Within the inner coiling 16 I arrange the heating means. This comprises an upper heating coil 30 carried by a cone 31 secured to and depending from the removable top plate 7. The cone 31 having of larger diameter toward its lower end serves to hold the wire 30 from dropping off. Extending upward from bottom plate 6 is an inverted cone 32 carrying heating coil The cones 31 and extend only about one-fourth the distance from top plate 7 to bottom plate 6. Between the free ends of these cones I arrange afurther heating means comprising rods 34 and 35 extending upward from a plate 36 of insulating material resting on the upper end of cone 32 and connected at their upper ends by plate 37, also of insulating material. Extend ing between these rods 34 and 35 are wires 38 adapted to be heated by current passing from one of these rods to the other.

40 and 41 indicate current inlet terminals to which the house current may be connected in the usual way, preferably by connecting means of fusible metal or otherwise provided with a connection adapted to be broken by excessive current. From the terminal plug 40 wire 42 leads to the upper end of the heating coil carried by cone 31 from the lower end of which coil 30 a wire 48 leads back to plug 40. From terminal plug 41 wire 44 leads to the lower end of coil 33 on inverted cone 32 and the upper end of coil 33 is connected with rod 35. From the upper end of rod 34 wire 45 leads back to plug 41.

By connecting plug 40 with the house service current will be conducted through the coil 30 effecting moderate heating of the water in the water carrying coils. By connecting plug 41 with the house service ourrent will be conducted through the heating coil 33 and the heating devices 34, 35 and 38, thus heating the water in the water carrying coils to a higher degree.

hen both plugs, 40 and 41, are connected with the house service all of the heating means are put into full operation heating the water in the water carrying coils even more rapidly and to a higher degree.

It will be understood that the space between the coiling 11 and the shell 5 should not be as great as shownbut should only be sutficient to allow for the connecting wires which are not shown.

A second metal case with wires 43' interposed may be arranged between the outer portion 11 of thewater carrying coil and the intermediate portion 14, this second case being secured at its lower edge to the bottom plate 6. Additional casings may be introduced be: tween the portions of the water carrying coil.

It is understood that the number of separate coilings of the water carrying coil may be greater or less than the three shown.

The cock shown at the upper end of the safetyvalve may be closed when only lowheat is employed.

Having thus described my invention what I claim is I. In an electric water heater an outer shell, an outer coil of pipe within and spaced away from the wall of the shell, having an inlet at its lower end, an inner coil of pipe continuous with the outer coil, a; wall of heat insulating material between the outer and the inner coil, a heating unit extending upward within the inner coil, a second heating unit extending downward within the inner coil, the inner coil of pipe comprising a doublecoil, one portion leading downward and the other leading upward and having a valve controlled outlet at its upper end.

2'. In an electric water heater an outer shell, an outer coil of pipe within and spaced away from the wall of the shell, having an inlet at one end, an inner coil of pipe continuous with the outer coil and having an outlet at its end, a wall of heat insulating material between the outer and the inner coil, a heating unit extending upward within the inner coil and a second heating unit extending downward within the inner coil, the inner coil being formed of pipe of less diameter than that of the pipe of the outer coil.

3. In an electric heater an outer shell, an outer coil of pipe within and spaced away from the wall of the shell, having an inlet at one end, an inner coil of pipe continuous with the outer coil extending downward and then upward and having an outlet at its upper end, a wall of heat insulating material about the inner coil between it and the outer coil, a heating unit extending upward within the inner coil and a third heating unit within the inner coil between the first and second heating units, and a faucet connected to the outlet and so mounted as to be capable of being swung on a vertical axis. 7

a. In an electric water heater an outer cylindrical shell having a fixed bottom and a removable cover, a cylinder of insulating material within the outer shell ext-ending upward from the bottom to near the upper end so arranged as to leave a substantial space between it and the wall of the outer shell, a coil of pipe arranged in said space extending to the upper end of the cylinder of insulating material and having an inlet at its lower end, a coil of pipe continuous with, but of less diameter than, the pipe in the space between the cylinder of insulatingmaterial. and the outer shell extending down within the cylin der of insulating material to near its lower end and thence upward to-the upper end of the cylinder of insulating material and having an outlet at its upper end, a heating unit detachably secured to the bottom of the outer shell and extending. upward within the coils second heating unit carried by the removable cover and extending down within said coils and a third heating unit carried by the first heating unit and extending upward within said coils toward the second heating unit and means for supplying current to said heating coils.

In testimony whereof, I hereunto aiii'x my signature.

MARIA M. ADAM.

within the cylinder of insulating material, 

